Document
L7900 series
Negative voltage regulators
Feature summary
■ ■ ■ ■ ■
Output current up to 1.5A Output voltages of -5; -6; -8; -12; -15; -18; -20; -24V Thermal overload protection Short circuit protection Output transition SOA protection
TO-220 TO-220FP
Description
The L7900 series of three-terminal negative regulators is available in TO-220, TO-220FP, TO-3 and D2PAK packages and several fixed output voltages, making it useful in a wide range of applications. These regulators can provide local on-card regulation, eliminating the distribution problems associated with single point regulation; furthermore, having the same voltage option as the L7800 positive standard series, they are particularly suited for split power supplies. If adequate heat sinking is provided, they can deliver over 1.5A output current.
D2PAK
TO-3
Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents.
Schematic diagram
www.DataSheet4U.com
January 2007
Rev. 11
1/24
www.st.com
24
L7900 series
Contents
1 2 3 4 5 6 7 8 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Test circuit ................................................ 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
www.DataSheet4U.com
2/24
L7900 series
Pin configuration
1
Figure 1.
Pin configuration
Pin connections (top view)
TO-220
TO220FP
D2PAK (Any Type)
TO-3
www.DataSheet4U.com
3/24
Maximum ratings
L7900 series
2
Table 1.
Symbol VI IO PD TSTG TOP
Maximum ratings
Absolute maximum ratings
Parameter DC Input voltage Output current Power dissipation Storage temperature range Operating junction temperature range for VO= 5 to 18V for VO= 20, 24V Value -35 V -40 Internally Limited Internally Limited -65 to 150 0 to 150 °C °C Unit
Note:
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied
Thermal Data
Parameter Thermal resistance junction-case Thermal resistance junction-ambient D2PAK 3 62.5 TO-220 3 50 TO-220FP 5 60 TO-3 4 35 Unit °C/W °C/W
Table 2.
Symbol RthJC RthJA
www.DataSheet4U.com
4/24
L7900 series
Test circuit
3
Figure 2.
Test circuit
Test circuit
www.DataSheet4U.com
5/24
Electrical characteristics
L7900 series
4
Table 3.
Symbol VO VO ∆VO(1) ∆VO(1) Id ∆Id ∆VO/∆T eN SVR .